Gary A Chastagner
Plant Pathologist &
Extension Specialist
Research Specialty and Interests
Epidemiology and management of Phytophthora ramorum in nurseries, Christmas trees and forests; the etiology, epidemiology and management of ornamental bulb crop and Christmas tree diseases; and factors that affect the postharvest quality of Christmas trees.
Professional Experience
- Plant Pathologist & Extension Specialist, Washington State University – Puyallup, 1999 to date.
- Plant Pathologist, Washington State University – Puyallup, 1989 to 1998.
- Associate Plant Pathologist, Washington State University – Puyallup, 1983 to 1989.
- Assistant Plant Pathologist, Washington State University – Puyallup, 1978 to 1983.
- Postdoctoral Research Associate and Lecturer, University of California – Davis, 1977-78
Education
- University of California – Davis, Ph. D. Plant Pathology, 1976
- University of California – Davis, M.S. Plant Pathology, 1973
- Calif. State University – Fresno, A.B. Biology and Industrial Arts, 1971
Awards/Honors/Memberships
- American Phytopathological Society (APS)
- APS Pacific Division
- International Society of Plant Pathology
- International Society of Horticultural Sciences (ISHS)
- Sigma Xi
- Pacific Northwest Christmas Tree Association President’s Appreciation Award - 2003
- Pacific Northwest Christmas Tree Association Barney Douglass Research Award – 2005
Selected Publications
Journal papers
Hollingsworth, R. G., G. A. Chastagner, N. J. Reimer, D. E. Oishi, P. J. Landolt and R. E. Paull. 2008. Use of shaking treatments and pre-harvest sprays of pyrethroid insecticides to reduce risk of yellowjackets and other insects on Christmas trees imported into Hawaii. Journal of Economic Entomology (In Press)
Chastagner, G. A., E. Hinesley, and J. Owen. 2008. Effect of two fire retardants on postharvest drying and flammability of Douglas-fir and Fraser fir Christmas trees. HortScience 43(1): 203-205.
Dart, N. L., Chastagner, G. A., E. F. Rugarber and K. Riley. 2007. Recovery frequency of Phytophthora ramorum and other Phytophthora spp. in the soil profile of ornamental retail nurseries. Plant Disease 91: 1419-1422.
Dart, N. L., and Chastagner, G. A. 2007. High recovery rate of Phytophthora from containerized nursery stock pots at a retail nursery highlights potential for spreading exotic oomycetes. Plant Health Progress doi:10.1094/PHP-2007-0816-01-BR.
Dart, N. L., and Chastagner, G. A. 2007. Estimated economic losses associated with the destruction of plants due to Phytophthora ramorum quarantine efforts in Washington State. Plant Health Progress doi:10.1094/PHP-2007-0508-02-RS.
Dart, N. L., Chastagner, G. A., Peever, T. L. 2007. Spread of Heterobasidion annosum in Christmas tree plantations of the United States Pacific Northwest. Phytopathology 97: 551-556.
Chastagner, G, A., E. Hinesley, and K. Riley. 2007. Effectiveness of I-V watering devices in maintaining postharvest freshness and quality of cut Christmas trees. Postharvest Biology and Technology 43: 178-181.
Chastagner, G. A. 2001. Susceptibility of intermountain Douglas-fir to Rhabdocline needle cast when grown in the Pacific Northwest. Plant Health Progress doi:10.1094/PHP-2001-1029-01-RS.
Dart, N. L., and Chastagner, G. A. 2007. Estimated economic losses associated with the destruction of plants due to Phytophthora ramorum quarantine efforts in Washington State. Plant Health Progress doi:10.1094/PHP-2007-0508-02-RS.
Dart, N. and G. Chastagner. 2006. Essential components to managing and monitoring for Phytophthora ramorum. Douglasia 30(3): 24-27.
Chastagner, G. A., and K. L. Riley. 2005. Sensitivity of pathogen inocula to chlorine dioxide gas. Acta Horticulturae 673 (1): 355-359.
Chastagner, G. A., and P. Kaufmann. 2005. Efficacy of fungicides in controlling leaf spot on bulbous iris. Acta Horticulturae 673 (2): 509-512.
Nielsen, U. B. and G. A. Chastagner. 2005. Variation in postharvest quality among Nordmann fir provenances. HortScience 40(3): 553-557.
Nielsen, U. B., and G. A Chastagner. 2005. Genetic variation in postharvest needle retention among Nordmann fir families and grafted clones. Scand. J. For. Research. Scandinavian J. Forest Research 20(4): 304-312
Copes, W. E., G. A. Chastagner, and R. L. Hummel. 2004. Activity of chlorine dioxide in a solution of ions and pH against Thielaviopsis brasicola and Fusarium oxysporum. Plant Dis. 88: 188-194.
Chastagner, G. A., U. B. Nielsen, and K. L. Riley. 2004. Comparison of the postharvest quality of noble fir boughs from the United States and Danish provenances grown in Denmark. HortScience 39(3): 580-583.
Technical
Chastagner, G. A., K. Riley and N. Dart. 2008. Phytophthora ramorum isolated from California bay laurel inflorescences and mistletoe: Possible implications relating to disease spread. Pp.169-172. In:
Frankel, S. J., J. T. Kliejunas, and K. M. Palmieri. Tech. Editors, Proceedings of the sudden oak death third science symposium. Gen. Tech. Rep. PSW-GTR- 214. Albany, CA: USDA Forest Service, Pacific Southwest Research Station. 491 p.
Chastagner, G. A., K. Riley and N. Dart. 2008. Spread and development of Phytophthora ramorum in a California Christmas tree farm. Pp.199-200. In: Frankel, S. J., J. T. Kliejunas, and K. M. Palmieri. Tech. Editors, Proceedings of the sudden oak death third science symposium. Gen. Tech. Rep. PSW-GTR- 214. Albany, CA: USDA Forest Service, Pacific Southwest Research Station. 491 p.
Chastagner, G. A., A. DeBauw, K. Riley and N. Dart. 2008. Effectiveness of fungicides in protecting conifers and rhododendrons from Phytophthora ramorum. Pp.325-334. In: Frankel, S. J., J. T.
Kliejunas, and K. M. Palmieri. Tech. Editors, Proceedings of the sudden oak death third science symposium. Gen. Tech. Rep. PSW-GTR- 214. Albany, CA: USDA Forest Service, Pacific Southwest Research Station. 491 p.
Dart, N. L., and G. A Chastagner. 2008. Estimated economic losses associated with the destruction of plants owing to Phytophthora ramorum quarantine efforts in Washington State. Pp.341-344. In:
Frankel, S. J., J. T. Kliejunas, and K. M. Palmieri. Tech. Editors, Proceedings of the sudden oak death third science symposium. Gen. Tech. Rep. PSW-GTR- 214. Albany, CA: USDA Forest Service, Pacific Southwest Research Station. 491 p.
Landgren, C., G. Chastagner, and K. Riley. 2008. Provenance and progeny growth and postharvest needle retention test results from Nordmann (Abies nordmanniana) and Turkish fir (A. bornmuelleriana) trials in Oregon and Washington. Pp 3-5. In:Thomsen, I. M., H. N. Rasmussen, J. M. Sørensen. Proceedings of the 8th International Christmas Tree Research & Extension Conference. Forest & Landscape Denmark, University of Copenhagen http://en.sl.life.ku.dk/upload/workingpapersno26.pdf
Wunderlich, L. and G. Chastagner. 2008. Challenges to managing Phytophthora root rot in California’s Sierra Nevada foothills. Pp. 42-45. In: Thomsen, I. M., H. N. Rasmussen, J. M. Sørensen. Proceedings of the 8th International Christmas Tree Research & Extension Conference. Forest & Landscape Denmark, University of Copenhagen http://en.sl.life.ku.dk/upload/workingpapersno26.pdf
Chastagner, G., K. Riley, and N. Dart. 2008. Risk of spread of Phytophthora ramorum in Christmas trees. Pp. 46-48. In: Thomsen,I. M., H. N. Rasmussen, J. M. Sørensen. Proceedings of the 8th International Christmas Tree Research & Extension Conference. Forest & Landscape Denmark, University of Copenhagen http://en.sl.life.ku.dk/upload/workingpapersno26.pdf
Chastagner, G., K. Riley, and C. Landgren. 2008. Variation in the susceptibility of noble fir (Abies procera) to current season needle necrosis. Pp 87-88. In: Thomsen, I. M., H. N. Rasmussen, J. M. Sørensen. Proceedings of the 8th International Christmas Tree Research & Extension Conference. Forest & Landscape Denmark, University of Copenhagen http://en.sl.life.ku.dk/upload/workingpapersno26.pdf
Hollingsworth, R., G. Chastagner, and G. Dermott. 2008. Efficacy of preharvest applications of permethrin in controlling infestations of yellowjackets (Vespula spp.) and other insects on harvested Christmas trees. Pp. 91-92. In Thomsen, I. M., H. N. Rasmussen, J. M. Sørensen. Proceedings of the 8th International Christmas Tree Research & Extension Conference. Forest & Landscape Denmark, University of Copenhagen http://en.sl.life.ku.dk/upload/workingpapersno26.pdf
Stark, J. D., A. Antonelli, G. Chastagner. 2008. The Grand Fir Twig borer (Argyresthia sp): A new pest of grand fir (Abies grandis) in the Pacific Northwest United States. Pp. 93-94. In: Thomsen, I. M., H. N. Rasmussen, J. M. Sørensen. Proceedings of the 8th International Christmas Tree Research & Extension Conference. Forest & Landscape Denmark, University of Copenhagen http://en.sl.life.ku.dk/upload/workingpapersno26.pdf
Extension and Industry
Bates, R., and G. Chastagner. 2008. Joint research project: Aims to identify superior sources of Canaan fir. American Christmas Tree Journal 52(5): 12-13.
Chastagner, G. 2008. Risk of Phytophthora ramorum infection in Christmas trees – An update. American Christmas Tree Journal 52(5): 18-19.
Chastagner, G., A. DeBauw, and K. Riley. 2008. Rehydration of noble and Fraser fir Christmas trees. Lookout 41(2): 29-30.
Antonelli, A., D. Tapio, J. Stark, and G. Chastagner. 2008. Failure of registered products to control needle midge? Lookout 41(3): 26-27.
Chastagner, G. and K. Riley. 2007. Solving the needle loss nuisance – Christmas tree research examines the effect of harvest date on true fir needle retention. Great Lakes Christmas Tree Journal 2(3): 36-39
Dart N.L., Chastagner G.A. 2007. Virtual Oomycete Demonstration Nursery: Online Interactive Education. WSU Online Resource. English version (http://www.puyallup.wsu.edu/ppo/)
Dart N.L., Chastagner G.A. 2007. Virtual Oomycete Demonstration Nursery: Online Interactive Education. WSU Online Resource. Spanish Version (http://www.puyallup.wsu.edu/ppo/)
Dart N.L., Chastagner G.A. 2007. Managing and monitoring Phytophthora ramorum in Washington nurseries: Online training module. English version (http://www.puyallup.wsu.edu/ppo/)
Dart N.L., Chastagner G.A. 2007. Managing and monitoring Phytophthora ramorum in Washington nurseries: Online training module. Spanish Version (http://www.puyallup.wsu.edu/ppo/)
Chastagner, G. and N. Dart. 2006. Washington State University’s Phytophthora ramorum research and outreach program. B & B 58(2): 10-11.
Chastagner, G. 2006. Washington State University dedicates new sudden oak death research lab at Puyallup. Christmas Tree Lookout 39(2): 11-12.
Landgren, C., J. Hart, and G. Chastagner. 2006. An update on research projects. Lookout 39(3) 38-40.
Dart, N.L., and G. A. Chastagner. 2006. Updates from WSU Phytophthora ramorum research and education program. B & B (Balls and Burlap): 58(12): 8-9.
Dart, Norman L., and Gary A. Chastagner. 2005. Washington State University’s P. ramorum Research and Outreach Program. B & B 58(2): 10-11.
Dart, Norman L., and Gary A. Chastagner. Research and Outreach: Essential Components to Managing and Monitoring for P. ramorum. Native Plant Society of Oregon Bulletin. September, 2006.
Chastagner, G. and J. Puffer. 2006. Clearing the field – The latest techniques in stump removal. American Christmas Tree Journal 50 (1): 12-14.
Ellen Goheen, Alan Kanaskie, Everett Hansen, Jennifer Parke, and Gary Chastagner. 2006. Sudden Oak Death and Phytophthora ramorum: A Guide for Forest Managers, Christmas Tree Growers, and Forest Tree Nursery Operators in Oregon and Washington. EM 8877, Oregon State University, 16 p.
Chastagner, Gary A., Norman Dart, and Kathy Riley. 2006. A Christmas Tree Grower’s Guide to Sudden Oak Death (Phytophthora ramorum). COMTF http://nature.berkeley.edu/comtf/
Research and Extension Center, Puyallup
Tel.: (253) 445-4528
Fax: (253) 445-4621
E-mail:chastag@wsu.edu
Professional Activities:
- Sudden Oak Death (SOD) – USDA-CPHST Technical Working Group for Phytophthora ramorum, 2008-date; APHIS Phytophthora ramorum Assessment Team, 2007; APHIS SOD BMP Workshop, 2007; APHIS SOD Science Panel, 2003-04 & 2006; California Department Food and Agriculture Science Advisory Panel, 2004; WSDA Nursery and Holiday Greenery Ad Hoc SOD Advisory Committees, 2004-date.
- ISHS - Working Group on Bulbs and Bulb Flowers, 1988-date; Organizing Committee for the Fifth International Symposium on Flower Bulbs, 1988-89; Scientific Committee for the Ninth (Japan, 2001-2004) and Tenth (Netherlands, 2007-2008) International Symposia on Flower Bulbs.
- APS – Pacific Division Councilor 1997-2000, Secretary-Treasurer 1984-86, President 1991-92; Working Group on Phytophthora kernoviae, 2007/08; Forest Pathology Committee, 2005-2008; Committee on Diseases of Ornamental Plants, 2000 – 2003, Chairman 2001-2002; Committee on Diseases of Ornamental Plants and Turf, 1980-87, Chairman 1986; National Meeting Program Committee, 1986, 2001; Advisory Committee for the APS Compendium of Turfgrass Diseases, 1982; APS Press Illustrations of Plant Pathogens and Diseases Committee, 1994-1997.
- Sigma Xi - President Tahoma Chapter, 1994-97
Heading using the h3 tag
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